Can one-way lists be created?

Hi,
     We have a need to create some class lists where only the instructors
can post to the lists, but nobody else.  Is this the same as creating a
moderated list where:

  1.  instructor is the moderator
  2.  dist file contains the e-addresses of all the students in the
        class
  3.  reject file contains the same entries as in the dist file

     Thanks in advance.

-- 

 US-Mail:  Larry Tai
           Department of Statistics
           368 Kerr Hall
           University of California, Davis
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